| Nominal Size or Basic Product Diameter | Body Diameter (E) | Width Across Flats (F) | Width Across Corner (G) | Head Height (H) | Radius of Fillet (R) | Thread Length (LT) | Transition Thread Length (Y) | Maximum Total Runout of Bearing Surface |
| (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Ref) | (Ref) | FIM |
| 1/2" | 0.482 | 0.850 | 0.969 | 0.302 | 0.009 | 1.00 | 0.19 | 0.016 |
| 5/8" | 0.605 | 1.031 | 1.175 | 0.378 | 0.021 | 1.25 | 0.22 | 0.019 |
| 3/4" | 0.729 | 1.212 | 1.383 | 0.455 | 0.021 | 1.38 | 0.25 | 0.022 |
| 7/8' | 0.852 | 1.394 | 1.589 | 0.531 | 0.031 | 1.50 | 0.28 | 0.025 |
| 1" | 0.976 | 1.575 | 1.796 | 0.591 | 0.062 | 1.75 | 0.31 | 0.028 |
| 1-1/8" | 1.098 | 1.756 | 2.002 | 0.658 | 0.062 | 2.00 | 0.34 | 0.032 |
| 1-1/4" | 1.223 | 1.938 | 2.209 | 0.749 | 0.062 | 2.00 | 0.38 | 0.035 |
| 1-3/8" | 1.345 | 2.119 | 2.416 | 0.810 | 0.062 | 2.25 | 0.44 | 0.038 |
| 1-1/2" | 1.470 | 2.300 | 2.622 | 0.902 | 0.062 | 2.25 | 0.44 | 0.041 |
ASTM A325 / ASTM F3125 (Heavy Hex Bolt)
ASTM A325 refers to ASME B18.2.6 for the exact dimensional requirements of heavy hex structural bolts, including diameter, length, thread length, head size, and bend radius.
ASME B18.2.6-2019
Dimensions of Heavy Hex Structural Bolts
| Nominal Size or Basic Product Diameter | Body Diameter (E) | Width Across Flats (F) | Width Across Corner (G) | Head Height (H) | Radius of Fillet (R) | Thread Length (LT) | Transition Thread Length (Y) | Maximum Total Runout of Bearing Surface |
| (Min) | (Min)(mm) | (Min)(mm) | (Min)(mm) | (Min)(mm) | (Min)(mm) | (Ref) | (Ref) | FIM |
| 1/2"(12/13mm) | 12.24 | 21.59 | 24.61 | 7.67 | 0.23 | 25.4 | 4.83 | 0.41 |
| 5/8"(16mm) | 15.37 | 26.18 | 29.85 | 9.60 | 0.53 | 31.75 | 5.58 | 0.48 |
| 3/4"(19mm) | 18.52 | 30.78 | 35.13 | 11.55 | 0.53 | 35.05 | 6.35 | 0.56 |
| 7/8"(22mm) | 21.64 | 35.41 | 40.36 | 13.48 | 0.78 | 38.1 | 7.11 | 0.64 |
| 1"(25mm) | 24.79 | 40.01 | 45.62 | 15.01 | 1.57 | 44.45 | 7.87 | 0.71 |
| 1-1/8"(28mm) | 27.89 | 44.60 | 50.85 | 16.71 | 1.57 | 50.8 | 8.64 | 0.81 |
| 1-1/4"(32mm) | 31.06 | 49.23 | 56.11 | 19.02 | 1.57 | 50.8 | 9.65 | 0.89 |
| 1-3/8"(35mm) | 34.16 | 53.82 | 61.36 | 20.57 | 1.57 | 57.15 | 11.17 | 0.96 |
| 1-1/2"(38mm) | 37.34 | 58.42 | 66.59 | 22.91 | 1.57 | 57.15 | 11.17 | 1.04 |
Maximum Grip Gaging Lengths and Minimum Body Lengths for Structural Bolts
| Maximum Grip Gaging Lengths and Minimum Body Lengths for Structural Bolts | |||||||||
| Nominal Diameter and Thread Pitch | |||||||||
| Nominal Length, L | 1/2" - 13TPI | 5/8" - 11TPI | 3/4" - 10TPI | 7/8" - 9TPI | 1" – 8TPI | 1 - 1/8" - 7TPI | 1 - 1/4" - 7TPI | 1 - 3/8" - 6TPI | 1 - 1/2" - 6TPI |
| (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | |
| 1 - 1/4" | - | - | - | - | - | - | - | - | - |
| 1 - 1/2" | 0.31 | - | - | - | - | - | - | - | - |
| 1 - 3/4" | 0.56 | 0.28 | - | - | - | - | - | - | - |
| 2" | 0.81 | 0.53 | 0.37 | - | - | - | - | - | - |
| 2 - 1/4" | 1.06 | 0.78 | 0.62 | 0.47 | - | - | - | - | - |
| 2 - 1/2" | 1.31 | 1.03 | 0.87 | 0.72 | 0.44 | - | - | - | - |
| 2 - 3/4" | 1.56 | 1.28 | 1.12 | 0.97 | 0.69 | - | - | - | - |
| 3" | 1.81 | 1.53 | 1.37 | 1.22 | 0.94 | 0.66 | 0.62 | - | - |
| 3 - 1/4" | 2.06 | 1.78 | 1.62 | 1.47 | 1.19 | 0.91 | 0.87 | - | - |
| 3 - 1/2" | 2.31 | 2.03 | 1.87 | 1.72 | 1.44 | 1.16 | 1.12 | 0.81 | 0.81 |
| 3 - 3/4" | 2.56 | 2.28 | 2.12 | 1.97 | 1.69 | 1.41 | 1.37 | 1.06 | 1.06 |
| 4" | 2.81 | 2.53 | 2.37 | 2.22 | 1.94 | 1.66 | 1.62 | 1.31 | 1.31 |
| 4 - 1/4" | 3.06 | 2.78 | 2.62 | 2.47 | 2.19 | 1.91 | 1.87 | 1.56 | 1.56 |
| 4 - 1/2" | 3.31 | 3.03 | 2.87 | 2.72 | 2.44 | 2.16 | 2.12 | 1.81 | 1.81 |
| 4 - 3/4" | 3.56 | 3.28 | 3.12 | 2.97 | 2.69 | 2.41 | 2.37 | 2.06 | 2.06 |
| 5" | 3.81 | 3.53 | 3.37 | 3.22 | 2.94 | 2.66 | 2.62 | 2.31 | 2.31 |
| 5 - 1/4" | 4.06 | 3.78 | 3.62 | 3.47 | 3.19 | 2.91 | 2.87 | 2.56 | 2.56 |
| 5 - 1/2" | 4.31 | 4.03 | 3.87 | 3.72 | 3.44 | 3.16 | 3.12 | 2.81 | 2.81 |
| 5 - 3/4" | 4.56 | 4.28 | 4.12 | 3.97 | 3.69 | 3.41 | 3.37 | 3.06 | 3.06 |
| 6" | 4.81 | 4.53 | 4.37 | 4.22 | 3.94 | 3.66 | 3.62 | 3.31 | 3.31 |
| 6 - 1/4" | 5.06 | 4.78 | 4.62 | 4.47 | 4.19 | 3.91 | 3.87 | 3.56 | 3.56 |
| 6 - 1/2" | 5.31 | 5.03 | 4.87 | 4.72 | 4.44 | 4.16 | 4.12 | 3.81 | 3.81 |
| 6 - 3/4" | 5.56 | 5.28 | 5.12 | 4.97 | 4.69 | 4.41 | 4.37 | 4.06 | 4.06 |
| 7" | 5.81 | 5.53 | 5.37 | 5.22 | 4.94 | 4.66 | 4.62 | 4.31 | 4.31 |
| 7 - 1/4" | 6.06 | 5.78 | 5.62 | 5.47 | 5.19 | 4.91 | 4.87 | 4.56 | 4.56 |
| 7 - 1/2" | 6.31 | 6.03 | 5.87 | 5.72 | 5.44 | 5.16 | 5.12 | 4.81 | 4.81 |
| 7 - 3/4" | 6.56 | 6.28 | 6.12 | 5.97 | 5.69 | 5.41 | 5.37 | 5.06 | 5.06 |
| 8" | 6.81 | 6.53 | 6.37 | 6.22 | 5.94 | 5.66 | 5.62 | 5.31 | 5.31 |
| 8 - 1/4" | 7.06 | 6.78 | 6.62 | 6.47 | 6.19 | 5.91 | 5.87 | 5.56 | 5.56 |
| 8 - 1/2" | 7.31 | 7.03 | 6.87 | 6.72 | 6.44 | 6.16 | 6.12 | 5.81 | 5.81 |
| 8 - 3/4" | 7.56 | 7.28 | 7.12 | 6.97 | 6.69 | 6.41 | 6.37 | 6.06 | 6.06 |
| 9" | 7.81 | 7.53 | 7.37 | 7.22 | 6.94 | 6.66 | 6.62 | 6.31 | 6.31 |
| 9 - 1/4" | 8.06 | 7.78 | 7.62 | 7.47 | 7.19 | 6.91 | 6.87 | 6.56 | 6.56 |
| 9 - 1/2" | 8.31 | 8.03 | 7.87 | 7.72 | 7.44 | 7.16 | 7.12 | 6.81 | 6.81 |
| 9 - 3/4" | 8.56 | 8.28 | 8.12 | 7.97 | 7.69 | 7.41 | 7.37 | 7.06 | 7.06 |
| 10" | 8.81 | 8.53 | 8.37 | 8.22 | 7.94 | 7.66 | 7.62 | 7.31 | 7.31 |
| Maximum Grip Gaging Lengths and Minimum Body Lengths for Structural Bolts | |||||||||
| Nominal Diameter and Thread Pitch | |||||||||
| Nominal Length, L | 1/2" - 13TPI | 5/8" - 11TPI | 3/4" - 10TPI | 7/8" - 9TPI | 1" – 8TPI | 1 - 1/8" - 7TPI | 1 - 1/4" - 7TPI | 1 - 3/8" - 6TPI | 1 - 1/2" - 6TPI |
| (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | (Min) | |
| 1 - 1/4"(31.8mm) | - | - | - | - | - | - | - | - | - |
| 1 - 1/2"(38.1mm) | 7.87 | - | - | - | - | - | - | - | - |
| 1 - 3/4"(44.5mm) | 14.22 | 7.11 | - | - | - | - | - | - | - |
| 2"(50.8mm) | 20.57 | 13.46 | 9.39 | - | - | - | - | - | - |
| 2 - 1/4"(57.2mm) | 26.92 | 19.81 | 15.75 | 11.94 | - | - | - | - | - |
| 2 - 1/2"(63.5mm) | 33.27 | 26.16 | 22.09 | 18.28 | 11.17 | - | - | - | - |
| 2 - 3/4"(69.9mm) | 39.62 | 32.51 | 28.45 | 24.64 | 17.53 | - | - | - | - |
| 3"(76.2mm) | 45.97 | 38.86 | 34.79 | 30.98 | 23.87 | 16.76 | 15.75 | - | - |
| 3 - 1/4"(82.5mm) | 52.32 | 45.21 | 41.15 | 37.34 | 30.23 | 23.11 | 22.09 | - | - |
| 3 - 1/2"(88.9mm) | 58.67 | 51.56 | 47.49 | 43.68 | 36.57 | 29.46 | 28.45 | 20.57 | 20.57 |
| 3 - 3/4"(95.3mm) | 65.02 | 57.91 | 53.85 | 50.04 | 42.93 | 35.81 | 34.79 | 26.92 | 26.92 |
| 4"(101.6mm) | 71.37 | 64.26 | 60.19 | 56.38 | 49.27 | 42.16 | 41.15 | 33.27 | 33.27 |
| 4 - 1/4"(108mm) | 77.72 | 70.61 | 66.55 | 62.74 | 55.63 | 48.51 | 47.49 | 39.62 | 39.62 |
| 4 - 1/2"(114.3mm) | 84.07 | 76.96 | 72.89 | 69.08 | 61.97 | 54.86 | 53.85 | 45.97 | 45.97 |
| 4 - 3/4"(120.7mm) | 90.42 | 83.31 | 79.24 | 75.44 | 68.33 | 61.21 | 60.19 | 52.32 | 52.32 |
| 5"(127mm) | 96.77 | 89.66 | 85.59 | 81.78 | 74.67 | 67.56 | 66.55 | 58.67 | 58.67 |
| 5 - 1/4"(133.4mm) | 103.12 | 96.01 | 91.95 | 88.14 | 81.03 | 73.91 | 72.89 | 65.02 | 65.02 |
| 5 - 1/2"(139.7mm) | 109.47 | 102.36 | 98.29 | 94.48 | 87.37 | 80.26 | 79.25 | 71.37 | 71.37 |
| 5 - 3/4"(146.1mm) | 115.82 | 108.71 | 104.65 | 100.85 | 93.75 | 86.61 | 85.59 | 77.72 | 77.72 |
| 6"(152.4mm) | 122.17 | 115.06 | 110.99 | 107.18 | 100.07 | 92.96 | 91.95 | 84.07 | 84.07 |
| 6 - 1/4"(158.8mm) | 128.52 | 121.41 | 117.35 | 113.54 | 106.43 | 99.31 | 98.29 | 90.42 | 90.42 |
| 6 - 1/2"(165.1mm) | 134.87 | 127.76 | 123.69 | 119.88 | 112.77 | 105.66 | 104.65 | 96.77 | 96.77 |
| 6 - 3/4"(171.5mm) | 141.22 | 134.11 | 130.05 | 126.24 | 119.13 | 112.01 | 110.99 | 103.12 | 103.12 |
| 7"(177.8mm) | 147.57 | 140.46 | 136.39 | 132.58 | 125.47 | 118.36 | 117.35 | 109.47 | 109.47 |
| 7 - 1/4"(184.2mm) | 153.92 | 146.81 | 142.75 | 138.94 | 131.83 | 124.71 | 123.69 | 115.82 | 115.82 |
| 7 - 1/2"(190.5mm) | 160.27 | 153.16 | 149.09 | 145.28 | 138.17 | 131.06 | 130.05 | 122.17 | 122.17 |
| 7 - 3/4"(196.9mm) | 166.62 | 159.51 | 155.45 | 151.64 | 144.53 | 137.41 | 136.39 | 128.52 | 128.52 |
| 8"(203.2mm) | 172.97 | 165.86 | 161.79 | 157.98 | 150.87 | 143.76 | 142.75 | 134.87 | 134.87 |
| 8 - 1/4"(209.6mm) | 179.32 | 172.21 | 168.15 | 164.34 | 157.23 | 150.11 | 149.09 | 141.22 | 141.22 |
| 8 - 1/2"(215.9mm) | 185.67 | 178.56 | 174.49 | 170.68 | 163.57 | 156.46 | 155.45 | 147.57 | 147.57 |
| 8 - 3/4"(222.3mm) | 192.02 | 184.91 | 180.85 | 177.04 | 169.93 | 162.81 | 161.79 | 153.92 | 153.92 |
| 9"(228.6mm) | 198.37 | 191.26 | 187.19 | 183.38 | 176.27 | 169.16 | 168.15 | 160.27 | 160.27 |
| 9 - 1/4"(235mm) | 204.72 | 197.61 | 193.55 | 189.74 | 182.63 | 175.51 | 174.49 | 166.62 | 166.62 |
| 9 - 1/2"(241.3mm) | 211.07 | 203.96 | 199.89 | 196.08 | 188.97 | 181.86 | 180.85 | 172.97 | 172.97 |
| 9 - 3/4"(247.7mm) | 217.42 | 210.31 | 206.25 | 202.44 | 195.33 | 188.21 | 187.19 | 179.32 | 179.32 |
| 10"(254mm) | 223.77 | 216.66 | 212.59 | 208.78 | 201.67 | 194.56 | 193.55 | 185.67 | 185.67 |
| Nominal Bolt Length Tolerance | ||
| Nominal Bolt Size | Through 6 | Over 6 |
| 1/2" | -0.12 | -0.19 |
| 5/8" | -0.12 | -0.25 |
| 3/4" through 1" | -0.19 | -0.25 |
| 1 - 1/8" through 1 - 1/2" | -0.25 | -0.25 |
| Chemical Requirements | ||||||
| Heat Analysis | 120 ksi/830 MPa Minimum | 150 ksi/1040 MPa Minimum | ||||
| Grade A325, A325M, F1852 | Grade A490, A490M, F2280 | |||||
| Type 1 | Type 3 | Type 1 | Type 3 | |||
| Carbon or Alloy Steel with or without Boron | Composition A | Composition B | Based on Corrosion Index | Alloy Steel with or without Boron | Based on Corrosion Index | |
| Carbon | 0.30 - 0.52 | 0.33 - 0.40 | 0.38 -0.48 | 0.30 - 0.52 max | 0.30 - 0.48C | 0.30 - 0.53 |
| Manganese | 0.60 min | 0.90 - 1.20 | 0.70 - 0.90 | 0.60 min | 0.60 min | 0.60 min |
| Phosphorus, max | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 |
| Sulfur, max | 0.040 | 0.040 | 0.040 | 0.040 | 0.040 | 0.040 |
| Silicon | 0.15 - 0.30 | 0.15 - .30 | 0.30 - 0.50 | D | D | D |
| Boron | 0.003 max | D | D | D | 0.003 max | D |
| Copper | D | 0.25 - 0.45 | 0.20 - 0.40 | 0.20 - 0.60 | D | 0.20 - 0.60 |
| Nickel | D | 0.25 - 0.45 | 0.50 - 0.80 | 0.20E min | D | 0.20E min |
| Chromium | D | 0.45 - 0.65 | 0.50 - 0.75 | 0.45 min | D | 0.45 min |
| Vanadium | D | D | D | D | D | D |
| Molybdenum | D | D | 0.06 max | 0.10E min | D | 0.10E min |
| Titanium | D | D | D | D | D | D |
| Number of Tests and Test Method or Criteria | |||
| Sample Size (Per Lot) | Test Method Inch | Test Method Metric | |
| All grades, types, styles Tensile Strength | F1470 | F606/F606M | F606/F606M |
| Proof Load | F1470 | F606/F606M | F606/F606M |
| Hardness | F1470 | F606/F606M | F606/F606M |
| Dimensions and Thread Fit | ASME B18.18 | ASME B18.18 | ASME B18.18 |
| Surface Discontinuities | F1470 | F788 | F788 |
| Coating Weight/Thickness | F1470A | Product Specification | Product Specification |
| 150 ksi grades all types and styles | |||
| Magnetic Particle | F1470 | F788 | F788 |
| Carburization/Decarburization | At least 1 | F2328 | F2328M |
| All Twist Off assemblies | |||
| Assembly Tension Test (Fastener Tension) | F1470 | This standard | |
| Rotational Capacity | F1470 | Annex A2 | Annex A2 |
| Mechanical Property Requirements for Bolts Tested Full Size | ||||||||
| 120 ksi - A325, F1852 | ||||||||
| Stress AreaA | Tensile Load (Min) | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | |||||
| in. | in2 | lbf | N | lbf | N | lbf | N | |
| 1/2" - 13TPI UNC | 0.142 | 17,050 | 75,842.18 | 12,050 | 53,601.07 | 13,050 | 58,049.29 | |
| 5/8" - 11TPI UNC | 0.226 | 27,100 | 120,546.81 | 19,200 | 85,405.86 | 20,800 | 92,523.01 | |
| 3/4" - 10TPI UNC | 0.334 | 40,100 | 178,373.69 | 28,400 | 126,329.49 | 30,700 | 136,560.4 | |
| 7/8" - 9TPI UNC | 0.462 | 55,450 | 246,653.89 | 39,250 | 174,592.7 | 42,500 | 189,049.42 | |
| 1" - 8TPI UNC | 0.606 | 72,700 | 323,385.71 | 51,500 | 229,083.41 | 55,750 | 247,988.35 | |
| 1 - 1/8" - 7TPI UNC | 0.763 | 91,600B | 407,457.1 | 64,900B | 288,689.58 | 70,250B | 312,487.57 | |
| 1 - 1/4" - 7TPI UNC | 0.969 | 116,300B | 517,328.17 | 82,400B | 366,533.46 | 89,200B | 396,781.37 | |
| 1 - 3/8" - 6TPI UNC | 1.155 | 138,600B | 616,523.51 | 98,200B | 436,815.36 | 106,300B | 472,845.96 | |
| 1 - 1/2" - 6TPI UNC | 1.405 | 168,600B | 749,970.16 | 119,500B | 531,562.48 | 129,300B | 575,155.05 | |
| Above values based on | 120 ksi | 85 ksi | 92 ksi | |||||
| 150 ksi - A490, F2280 | ||||||||
| Tensile Load (Min) | Tensile Load (Max) | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | |||||
| in. | lbf | N | lbf | N | lbf | N | lbf | N |
| 1/2" - 13TPI UNC | 21,300 | 94,747.12 | 24,600 | 109,426.25 | 17,050 | 75,842.178 | 18,500 | 82,292.1 |
| 5/8" - 11TPI UNC | 33,900 | 150,794.71 | 39,100 | 173,925.46 | 27,100 | 120,546.81 | 29,400 | 130,777.72 |
| 3/4" - 10TPI UNC | 50,100 | 222,855.9 | 57,800 | 257,107.21 | 40,100 | 178,373.69 | 43,400 | 193,052.82 |
| 7/8" - 9TPI UNC | 69,300 | 308,261.76 | 79,950 | 355,635.32 | 55,450 | 246,653.89 | 60,100 | 267,338.12 |
| 1" - 8TPI UNC | 90,900 | 404,343.34 | 104,850 | 466,396.035 | 72,700 | 323,385.71 | 78,800 | 350,519.86 |
| 1 - 1/8" - 7TPI UNC | 114,450 | 509,098.962 | 132,000 | 587,165.251 | 91,550 | 407,234.69 | 99,200 | 441,263.58 |
| 1 - 1/4" - 7TPI UNC | 145,350 | 646,549.01 | 167,650 | 745,744.351 | 116,300 | 517,328.172 | 126,000 | 560,475.92 |
| 1 - 3/8" - 6TPI UNC | 173,250 | 770,654.392 | 199,850 | 888,977.087 | 138,600 | 616,523.514 | 150,200 | 668,122.88 |
| 1 - 1/2" - 6TPI UNC | 210,750 | 937,462.702 | 243,100 | 1,081,362.67 | 168,600 | 749,970.162 | 182,600 | 812,245.26 |
| Above values based on | 150 ksi | 173 ksi | 120 ksi | 130 ksi | ||||
| Mechanical Property Requirements for Bolts Tested Full Size | ||||||||||||||||||
| 830 MPa - A325M | 1040 MPa - A490M | |||||||||||||||||
| Stress AreaA | Tensile (Min) | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | Tensile min | Tensile max. | Proof Load Length Measurement (Min) | Alternative Proof Load Yield Strength Method (Min) | |||||||||||
| mm | mm2 | kN | kN | kN | kN | kN | kN | kN | ||||||||||
| M12 x 1.75 MC | 84.3 | 70 | 50.6 | 55.6 | 87.7 | 103 | 70 | 79.2 | ||||||||||
| M16 x 2.0 MC | 157 | 130 | 94.2 | 104 | 163 | 190 | 130 | 148 | ||||||||||
| M20 x 2.5 MC | 245 | 203 | 147 | 162 | 255 | 296 | 203 | 230 | ||||||||||
| M22 x 2.5 MC | 303 | 251 | 182 | 200 | 315 | 366 | 251 | 285 | ||||||||||
| M24 x 3.0 MC | 353 | 293 | 212 | 233 | 367 | 427 | 293 | 332 | ||||||||||
| M27 x 3.0 MC | 459 | 381 | 275 | 303 | 477 | 555 | 381 | 431 | ||||||||||
| M30 x 3.5 MC | 561 | 466 | 337 | 370 | 583 | 679 | 466 | 527 | ||||||||||
| M36 x 4.0 MC | 817 | 678 | 490 | 539 | 850 | 989 | 678 | 768 | ||||||||||
| Above values based on | 830 Mpa | 600 Mpa | 660 Mpa | 1040 Mpa | 1210 Mpa | 830Mpa | 940Mpa | |||||||||||